UnScramble this Word: o b i e d d f n r?

Questions

Each day, 100 or more whales are killed by ----------?

Kangaroos usually give birth to one young annually. The young kangaroo, or joey, is born alive at a very immature stage, when it is only about 2 cm long and weighs less than a ----------?

---------- eels are not really eels but a kind of fish. Although they look like eels, their internal organs are arranged differently.?

As a rule, many birds generally lay fewer eggs in a clutch in the ----------, where the amount of daylight is shorter than in northern latitudes. It is in the northern reaches of the world that more summer food for birds is available as a result of the longer days.?

Kittens are born both blind and deaf, but the vibration of their mother's purring is a physical signal that the kittens can feel - it acts like a ----------, signaling them to nurse.?